What is a void pointer?

Question

If I correct , by default main () function has integer return type.
I want to know what happens in the system internally when its return type gets changed from integer to void ?

Answer 1

Void pointer is a special type of pointer that can point to any data type. A void pointer is declared like a normal pointer, using the void keyword as the pointer’s type.

Example
int a = 5;
void *pVoid = &a; // pVoid is now pointing to an integer

Few things to remember -
1. A void pointer can not be dereferenced, a void pointer must first be explicitly cast to another pointer type before it is dereferenced.
2. It is not possible to do pointer arithmetic on a void pointer.

As a good programming practice avoid void pointer as much as possible.